When I redo one of my tanks I want to put something down to help protect the glass if a rock falls or shifts. I've been trying to find egg crate (light diffuser) but I give up. Been ringing and visiting lighting and hardware stores and they all don't have it.
I was thinking styrofoam but would it break down or release chemicals? I know it's used in false rock backgrounds but it's sealed. This won't be.
Any thoughts or suggestions?

When I redo one of my tanks I want to put something down to help protect the glass if a rock falls or shifts. I've been trying to find egg crate (light diffuser) but I give up. Been ringing and visiting lighting and hardware stores and they all don't have it.
I was thinking styrofoam but would it break down or release chemicals? I know it's used in false rock backgrounds but it's sealed. This won't be.
Any thoughts or suggestions?

I'm just thinking out loud here, what about like a piece of rubber similar to a yoga mat?

All good. it goes glass bottom, then egg crate or whatever, then stones/rocks then substrate to cover the bottom. If a rock falls it hits the egg crate not the glass bottom and the force is more evenly distributed. It protects the glass.

All good. it goes glass bottom, then egg crate or whatever, then stones/rocks then substrate to cover the bottom. If a rock falls it hits the egg crate not the glass bottom and the force is more evenly distributed. It protects the glass.

I'm surprised they don't have a light diffuser there Mumma, but i've never been there so I don't know what kind of lighting they have in their buildings. It is/was a commonplace thing in govt buildings like schools and whatnot.